[webmap-discuss] OGC and google style tiling
Ehud Shabtai
eshabtai at gmail.com
Fri Apr 14 04:34:50 EDT 2006
I think that the first step should be just to use ka-map's tiles from
within mapbuilder. This would enable the usage of ka-map's tile
caching along with mapbuilder.
As each tile does have a standard URL this should be similar to the
google api support in mapbuilder?
On 4/14/06, Cameron Shorter <cameron.shorter at gmail.com> wrote:
> The "standard URL" I was refering to is the URL of a tile.
>
> Both ka-map and mapbuilder have both implemented much of the same
> functionality. We will need to work out a logical place to split
> between the ka-map code and the mapbuilder code.
>
> I think it would be difficult to use Mapbuilder without Mapbuilder
> controls. Probably what we would need to do is convert your ka-map
> tools to fit within the Mapbuilder framework.
>
> Paul Spencer wrote:
> > Cameron,
> >
> > what do you mean by standard url? ka-Map has a javascript API that
> > handles all the navigation including the smooth panning of the map.
> > While not exactly like google, the api is roughly equivalent.
> >
> > Not sure if you could use mapbuilder's controls or not, it would be
> > cool if you could.
> >
> > I'll take a stab at installing/running MapBuilder this weekend. Do I
> > need to do anything special to use the Google Map layer?
> >
> > Cheers
> >
> > Paul
> >
> > On 13-Apr-06, at 6:26 AM, Cameron Shorter wrote:
> >
> >> Paul,
> >> I'm currently allowing a Google Map layer to be included as one of
> >> the layers rendered by Mapbuilder.
> >>
> >> So if you have a standard URL used to call a tiled map server, then
> >> we can create a Mapbuilder Layer which accesses the URL (we'd
> >> probably base our code on your existing ka-maps code).
> >>
> >> I'd expect that we would use the Mapbuilder pan/zoom type tools and
> >> buttons rather than the ka-map tools.
> >>
> >> Is that what you were thinking about?
> >>
> >> Paul Spencer wrote:
> >>
> >>> What would be really nice would be to have a MapBuilder widget for
> >>> ka- Map ;) Mike Adair has mentioned that this is both possible and
> >>> quite easy to do. Not being very familiar with MapBuilder, I can't
> >>> comment on that. But if it were possible to do, ka-Map would
> >>> provide you a tiled interface and you could use your existing map
> >>> file to do it without breaking ogc compatibility.
> >>> Cheers
> >>> Paul
> >>> On 12-Apr-06, at 4:33 AM, Steven M. Ottens wrote:
> >>>
> >>>> Hi Bart,
> >>>>
> >>>> Thanks for the mailinglist tip.
> >>>> It might be possible to rasterize our vector data, but we've got quite
> >>>> some datasets and there will be more of them. It also makes us less
> >>>> flexible. Obviously we've to make a trade-off on flexibility and
> >>>> speed.
> >>>> We hope that with cached tiles we can have both the flexibility and
> >>>> speed. If we rasterise it would make sense to rasterise into fixed
> >>>> tiles
> >>>> I guess.
> >>>>
> >>>> Steven
> >>>>
> >>>> Bart van den Eijnden wrote:
> >>>>
> >>>>> Hi Steven,
> >>>>>
> >>>>> there is an OGC list to discuss tiling:
> >>>>>
> >>>>> http://lists.eogeo.org/mailman/listinfo/tiling
> >>>>>
> >>>>> check the archives there.
> >>>>>
> >>>>> What you could also do, since I assume your data is pretty much
> >>>>> static, is
> >>>>> use UMN Mapserver to rasterize all your vector data (create
> >>>>> Geotiffs e.g.)
> >>>>> and serve out the rasters instead. I guess the classifications
> >>>>> used are
> >>>>> heavy on CPU usage, and pre-classified rasters would solve that
> >>>>> part at
> >>>>> least.
> >>>>>
> >>>>> Best regards,
> >>>>> Bart
> >>>>>
> >>>>>
> >>>>>> Hi all,
> >>>>>>
> >>>>>> For those who don't know: I'm one of the lead developers on the
> >>>>>> EduGIS
> >>>>>> project, a site which aims to introduce highschool students to
> >>>>>> GIS. The
> >>>>>> site contains a webmapping part, which combined with so called
> >>>>>> 'lesson-modules' can be used inside the classroom.
> >>>>>> We aim to be able to have at least 200 students access the site
> >>>>>> at one
> >>>>>> time. Since it's being used inside the classroom it means that a
> >>>>>> lot of
> >>>>>> students will do more or less the same thing at the same time
> >>>>>> (following
> >>>>>> the tasks in the lesson-modules). This causes quite some stress
> >>>>>> on the
> >>>>>> server. Since it's a free site we have limited budget and cannot
> >>>>>> put a
> >>>>>> google-style server park behind it ;(
> >>>>>>
> >>>>>> Right now we've got apache to serverside cache the umn mapserver
> >>>>>> output.
> >>>>>> This obviously works only for those images that are requested twice
> >>>>>> (like the first mapimage). Right now about 30 students can work
> >>>>>> at the
> >>>>>> same time without it becoming unworkable slow. Since serverside
> >>>>>> caching
> >>>>>> works, the next logical step to boost performance would be using
> >>>>>> tiles
> >>>>>> like google.
> >>>>>> But..
> >>>>>> From what I know, tiling breaks OGC compatibility, right?
> >>>>>> We're using Mapbuilder as client and we prefer to keep using it,
> >>>>>> since
> >>>>>> it's turning into a rather featureful client on the EduGIS site.
> >>>>>> But the
> >>>>>> question arises how to implement tiling inside WMC/OWS-context
> >>>>>> without
> >>>>>> breaking OGC too much.
> >>>>>> Also I'm interested in the used algorithms to get tiling working.
> >>>>>>
> >>>>>> Cheers,
> >>>>>> Steven
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> ------------------------------------------------------------------
> >>>>>> -- -
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> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> ------------------------------------------------------------------- --
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> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>> -------------------------------------------------------------------- -
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> >>>>
> >>> +-----------------------------------------------------------------+
> >>> |Paul Spencer pspencer at dmsolutions.ca |
> >>> +-----------------------------------------------------------------+
> >>> |Applications & Software Development |
> >>> |DM Solutions Group Inc http://www.dmsolutions.ca/|
> >>> +-----------------------------------------------------------------+
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: webmap-discuss-unsubscribe at mail.osgeo.org
> >>> For additional commands, e-mail: webmap-discuss-help at mail.osgeo.org
> >>
> >>
> >>
> >> --
> >> Cameron Shorter
> >> http://cameron.shorter.net
> >>
> >> ---------------------------------------------------------------------
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> >>
> >
> > +-----------------------------------------------------------------+
> > |Paul Spencer pspencer at dmsolutions.ca |
> > +-----------------------------------------------------------------+
> > |Applications & Software Development |
> > |DM Solutions Group Inc http://www.dmsolutions.ca/|
> > +-----------------------------------------------------------------+
> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> >
>
>
> --
> Cameron Shorter
> http://cameron.shorter.net
>
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>
>
--
Ehud Shabtai
http://www.freemap.co.il/map/
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